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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd95e4dd1c3c190503304c9a4112a3ffdfe6aa9bae3e6f028084d8e53e80c35' 
  AND token = 'aJUvQNzDegBZDtnSH8T50Seaq7JzeuYlXQgEOIwpoCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}